Tractor wheel



w. H. LEDBl-:TTER

TRACTOR WHEEL Filed April 27, 1929 me la, 1935.

3 Sheets-Sheet l HNVENTOR June 18, 1935. w. H. LEDBETTER TRACTOR WHEELFiled April 27, 1929 3 Sheets-Sheet 2 Num 00, 1935. W, H, EDBETTER2,005,550

TRACTOR WHEEL Filed April 27, 1929 5 Sheets-Sheet 5 ATTORNEYS PatentedJune 18, 1935 y UNITED entres .agregar TRACTOR, WHEEL Wiiliam H.Ledbetter, Dallas, Terr.

Application April 27, 1929, Serial No. 358,509

l2 Claims. (Cl. Sill-41) This invention relates to a wheel for use onfaces of which are flush with or in the same perivehicles and the likebut the wheel is adapted pheral plane or dened by the same radius as forother uses and more particularly the inventhe rim means, and the sidefaces of the free-end tion relates to tractor wheels. teeth are formedto be in the plane of the wheel 5 An object of the invention is toproduce a radius or in the spoke plane; and the rim means ,5

wheel, whether for tractors or other uses, which and teeth structurepreferably are fabricated in is novel, among other things, in its rimand tracpart or entirely from iron bar stock. tion lug construction.Furthermore a purpose is v The accompanying drawings illustrate severalto produce a vehicle wheel, as for tractors, which concrete embodimentsof the invention serving to is so constructed as to avoid clogging,choking show the principles thereof and it is to be underll0 or fillingwith earth despite the fact that the stood that changes in constructionand use may wheel possesses maximum traction or ground be resorted towithout departing from the scope gripping and teeth means. To thisendthe inof the invention. vention affords an open rim or felloe withground All examples of the invention shown include lugs or teeth soformed that the dirt tends to what may be called outside free end groundteeth 15 rapidly fall. away from the wheel as the latter lying in thecircle ci the wheel radius and which turns. ailord maximum traction inthat they cut into A further object is to produce a wheel rim the groundbut they are formed to run free of or felloe construction which includesground clogging and balling up with mud and dirt and teeth or tractionlugs of an improved form and they do not damage the road surface because`20 which lugs have their one ends carried onl the the tread faces ofthe ground teeth do not proside surfaces of the Wheel rim and they otherject beyond the tread face of the wheel rim. ends of the teeth are freeor unattached and Figures l through 8 illustrate one form of the projector stand out at an angle` from the rim. invention showing a double rimor felloe con- In this way a wheel is produced, the tread face structionand attachments therefor. Y `25 of which is smooth despite the fact thata large Figure 1 shows an edge or tread face View o number of groundgripping teeth are provided. the double rim wheel, as for example atractor In carrying out the aforementioned object of wheel, stretchedout in diagrammatic plan form; my invention having to do with the novelrim andFigure 2 shows a side view of a fragment of structure, Ifabricate a rim from standard duplithis wheel. Both views show differentpositions 30 cate, or similar segments or sections any one or ofauxiliaryground gripping teeth which may be more of which, when damagedor bent, may be changed and adjusted to meet all conditions. replacedwith a new segment or section. In this Figure 3 shows an edge view ofone of the connection it is a further object to produce rim segmentsused in building up this type of wheel;

segments or sections which may include ground and Figure i is an endView thereof. A plu- 35 gripping or traction teeth; and the overlappingrality of these parte are assembled and anchored segments alone, or withadditional tread means, together to makea complete wheel. v form a wheelthe tread of which comprises a Figure 5 shows a tread face fillersection or double, triple or multiple ply construction. rim plateadapted to be inserted between the A further general object is toproduce a tractor double rim or felloe to produce a closed or solid 40wheel, the lugs or ground teeth of which are subface wheel. stantiallyflush with the tread face of the wheel Figure 6 shows one form ofauxiliary traction or at least do not project therebeyond so as to lugor ground tooth used on a double rim wheel avoid digging into anddamaging the surface of ci the type built up from segments shown in aroad or drive when the tractor wheel rolls in Figures 3 and 4, and thistooth functions in the 45 contact therewith. In this connection, it iswell known way since it projects beyond the also a purpose to produce awheel rim substantread face of the wheel, but other ground teeth tialiythin at its outer face so that the wheel will of a more preferred formto be described are out or sink into the earth suhciently deep todisposed on the same radius as the tread face cause the ground grippingteeth or lugs to secure and hence will not damage a road when the 50 asubstantially rm purchase or hold in the tractor travels thereon.

earth to gain maximum tractive eort. Figure 7 shows an auxiliary groundtooth made A further object is tovproduce a wheel con# from angle ironand Figure 8 is one made from struction including a rim means carryingireeiiat bar stock. Both forms of teeth are well end outstandingtraction teeth the outer tread adapted to the wheel shown in Figures 1and 2 55 and work on a greater radius than the tread face of the wheel.

Figures 9 through 13 show another form of the invention wherein a singlerim wheel is fabricated from ring or rim segments which may haveoutturned traction lugs so disposed as to leave smooth the tread face ofthe wheel.

Figure 9 shows a plan, edge or tread face view of the single rim wheellaid out in diagrammatic form; and Figure 10 is a side view of afragment of the complete wheel.

Figure l1 is a View of a segment from which this type of wheel isconstructed.

Figures l2 and i3 illustrate different types of auxiliary traction orground teeth, the rst being a flush tread face free end type of tooth,and the latter being a projecting type of ground tooth.

Figures 14 through 17 illustrate a third modified form of wheelconstruction fabricated from another form of rim segment to build up awheel shown in single rim form but which may be used for double rims ifdesired.

Figure le is a plan diagram looking at the tread face; and Figure 15shows a side View of this wheel.

Figure 16 shows two of the rim segments joined together illustrating themethod of fabricating this type of wheel; and Figure 17 is a crosssectional view taken on the line Il l'l. These two views show the treadface of rim segments bevelled or sharpened so the wheel will sink intothe ground and hence cause the ground teeth to dig in to obtain bettertraction.

Figures 18 and 19 show a fourth form of the invention wherein asegmentally constructed wheel of single rim form is assembled upon acontinuous or solid ring, Figure 18 being an edge or tread face view,and Figure i9 being-a side view. This form is just as well adapted tomul-- tiple rim wheels, one example of which is shown in Figures 1 and2.

Figure 20 shows a perspective view of an auxiliary ground tooth used asa traction lug on several types of the wheels and one of these teeth isshown mounted in operative position in Figures 14 and 15.

Describing in further detail, nrst that form of vthe invention shown inFigures 1 through 8, it is observed that I have produced a double rimmeans or felloe wheel assembly made of vstandard rim segments and thewheel is oi open face formation so the dirt tending to accumulate on thewheel will fall away as the wheel turns. This type of wheel isparticularly useful for heavy tractors and is novel, among other things,in its segmental construction and its outstanding free end ground teeth.

The segment from which this double rim segment type wheel is built issimple in construction and includes a transverse portion or groundgripper bar 5 carried between spaced parallel rim segment portions 6which are extended circumferentially on a radius of proper length toproduce the correct wheel diameter and the sections terminate in freeend outturned lugs forming kground lugs or teeth l. Each lug l may beprovided with a hole t to receive and anchor van auxiliary ground toothof any suitable construction, examples of which are shown in Figures 7and 8. The ground teeth i may be called flush tread face free end teethsince they do not project above or beyond the tread edge or face of thewheel and since their outer ends are free and not attached to a rim; andthe front and rear faces of the teeth lie in or substantially parallelto the spoke plane or wheel radius.

The segmental rim member 5 6 shown in Figure 3 is merely an example ofone form of construction and serves to illustrate the principles of thatconcrete embodiment of the invention shown as the first form. In someinstances, the circumferential portion 6 is swedged or bent outwardly toform an onset HJ in the circular portion l5 for the reception of theadjacent mating segment of like construction to be anchored thereto. Thesegmental member shown in Figures 3 and i may be constructed from asingle bar and is arched or curved on a radius conforming to the size ofthe wheel and the 'transverse distance between the parallel rims S ismade to equal the width desired for the wheel. The cross tread bar 5 isdisposed at any suitable angle to the parallel rims 6. The segment bar 55 and its teeth l may be set edgewise to the ground so as tosecureeffective penetration thereof into the earth.

As shown in the assembly'views, the curved rim segments or rim means Smay be corrugated or grooved at i2 so as to produce a rigid interttingsegmental joint when the parts are assembled. As in Figure l, thegrooved formation E 2 may be used in some of these wheels, Whereas inFigures 3 and 4 this grooved or corrugated design is omitted.

In producing a wheel from bar segments 5 6 of this general shape, anumber thereof are riveted together to complete the rim circle. Rivets,bolts or other anchorage means lll are employed, orthe joints are weldedif desired. rIhe anchorage means i4 connect the two ends of a segment 56 to the inner portions of the rim 6 next to the transverse bar 5. wordsthe anchorage means lli join together the adjacent segments at theirextremities and adjacent their transverse tread cross bars forming theground grippers 5.

.Spokes I5 radiate from a hub il and double or single rivet anchoragemeans i8 secure the outer ends of the spokes I6 to the rims 8, as byover- This Fluted form In other any possibility of displacement betweenthe4 parts, although the spoke rivets I8 are alone face of the wheel toprovide additional traction means required for certain work. The teeth22 are curved to conform to the curve of the bar In Figure 5 there isshown a tread plate 24',

a plurality of which are adapted to close this open face wheel andproduce a solid rim structure to travel on roads and the like. Thistread plate comprises a face 2t having inturned parallel flanges 25formed with bolt holes 2t. The tread plates 24 fit between the twoparallel tread bars 5 and rims `6 and arev anchored in place by bolts 21to close the open face wheel and are easily removed. The tread plate l24is fashioned from sheet metal and its face is curved on a radiusconforming to that of the rim segments 6. Ordinarily a pair of bolts 21are suflicient to extend through the flanges 25 of two adjacent treadplates placed on each side of the transverse tread bar 5 and thus anchorthe adjacent ends of the plates to the wheel by one set of bolts.

A feature of the wheel relates to the outturned lugs 1 made on one orboth ends of the segments 5 6. Since the lugs 1 are a continuation ofeach rim segment 6, the tread faces or edges of the lugs 1 are iiushwith the tread faces of the segments 6. Thus the lugs 1 have tread facesin the same peripheral line and on the same radius as the tread of therims 6. Therefore the lugs 1 do not dig into and damage the surface o aroad or pavement when the tractor is crossing or travelling thereon, andthe toothed wheel easily rolls on a hard road without jolting andjarring the tractor.

The parallel rim segments 6 are made from suitable bar stock ofsubstantially thin form so the wheel will sink into the earth whenplowing or performing other work requiring effective traction. The thinrim segments 6 enable the double rim to penetrate the surface of thesoil as the wheel rolls along the ground and the outwardly directed ireeend lugs 1 establish a positive hold in the ground to prevent the wheelfrom slipping when the tractor is pulling in the soft ground. The groundteeth have their inner ends carried on the side ci the rim and theirouter ends are free which produces a dirt shredding construction.- Afeature of the construction also resides in the position or" thefree-end teeth 1 with their faces parallel to or in the wheel radii.

Since the outer ends of the lugs 1 are free and unattached to a rim, thedirtv rap-idly falls away therefrom as it tends to build up on thewheel. While dirt or mud may collect within the open faced wheelconstruction between the parallel rims B and transverse bars 5, this isnot true of the outer part of the wheel adjacent the free end lugs 1 forthe reason that the outer lug .ends being free and unattached to a rim,the dirt which accumulates has no adjacent rim portion to which it mayadhere and hence drops oft. Freed of the rim obstruction, there is lessopportunity for the dirt to build and ll in the open wheel spaces aboutthe teeth 1.

'In Figure 7 there is shown an auxiliary traction lug tooth which may beused on the tractor wheel when it is fitted up for heavy going requiringextra tractive effort. This angle bar ground tooth 33 is well suited forheavy duty work since it includes angular portions 3l and fill whichestablish a rigidly braced construction when mounted as shown at 33 inFigure 1. It rests in a corner formed by an intersecting lug 'l and rimsegment 6 and is anchored to one or both of these parts by a bolt 34.This tooth is made with a number of holes 35 and hence it is adjustableoutwardly or inwardly toincrease or decrease the length of the toothprojecting from the tread face of the wheel. Furthermore this tooth 33may be inverted so as to extend its point towards the hub I1 and thusconveniently carry it on the wheel out of the way when not in use.

In Figure 8 there is shown another ground lug in the form of a flat bartooth v36 which may be pointed and provided with holes 31. This tooth isalso adjustable in and out on the lugs 1 to which it is fastened bybolts. The tooth 36 is shown in both positions in Figures 1 and 2 whereit is readily seen just how the tooth is turned inwardly when not in useand how it is mounted with its point projecting outwardly in anadjustable manner when in use.

Coming now to a description of that form oi the wheel invention shown inFigures 9 through 13, it is observed that this type of wheel is ofsingle rim construction and is built up from standard felloe or rimsections or segments one of which is shown in perspective in Figure Il*land which includes a flush tread and free end type of ground tooth atone or both ends thereof.

The segment for producing this form of wheel includes a curved bar 4tset edgewise and offset at all producing parallel portions 40 and `42.The bend 4l is swedged into the bar to produce an oifset at about thecentral portion thereof equal to substantially the thickness of the bar.Each end of this segment is made with an outturned free end ground tooth43 or t4. Rivet or bolt holes 45 are punched in the segmental bar nearits ends adjacent the teeth 43 and 44. This edgewisely disposed bar iscurved on a radius equal to that of the wheel to be produced and henceits tread face designated at 45 forms a similar tread face 41 on theoutturned lugs or ground teeth 43 and 44. In other words the entiretread face 4B-41, throughout the length of the segment t2- 46, is smoothand a continuation of the edge or wheel periphery which rotates inContact with the ground because the two treads 46 and 41 are on the sameradius.

A plurality of these rim segments fili- 42 are anchored together withrivets, bolts or other anchorage means 48 or by welding. The outturnedground tooth 43 at one end of each segment projects outwardly from therim. lll-l2 in a direction opposite to that of the other ground tooth 44on the adjacent attached rim segment. It is significant that the treadface or ground engaging edge 46-41 is perfectly smooth and noprojections extend thereabove to cut into or dent the surface of a roadwhen the wheel is travelling along the road and furthermore the wheelrolls without vibration. The teeth i3 and lll are carried on the side ofthe rim segments of the wheel and project free ended therefrom. Gne endor the inner end of the lug is attached to or integral with the side ofthe wheel rim but the other or outer end is free and detached from anywheel portion; and the parallel faces of the teeth i3 and 44 aredisposed radially and. lie in the direction of the wheel spokes orradii. The rim and teeth means are preferably constructed of iron barstock.

Spokes lill radiate from the hub 5l to support the fabricated rim. Thespokes are welded or otherwise secured as by rivets a2 to the rimlFit-42 forming the wheel. While the spokes E@ are shown as beingstaggered against the outside faces of the builtup rim, alternately onboth sides of the rim, they may be otherwise arranged as desired.

In Figure l2 there is shown an auxiliary ei;- tension ground tooth forincreasing the tractive effort of the wheel. The tooth lill has anupturned end to form a foot 54. `Holes 55 are made in this tooth toanchor it to the wheel with bolts or rivets 56. These extension teeth 53are substantially` longer than the integral ground teeth i3 and llt andare attached to the wheel when it is tted up for heavy going where extratractive effort is required. The kground teeth 52E are placed againstthe rim of the wheel and in the corner dei-ined by the wheel rim andteeth t3 or fifi. Thisextension tooth is also of the iiush tread faceand free end type.

In Figure 13 there is shown an angle iron tooth 5'? having holes 5% foruse in connection with the wheel shown in Figures 9 and 1G. The severalholes 53 provide means for adjusting the angle iron tooth 5l in and outrelatively to the tread face of the wheel. This tooth 5l can be reversedand projected inwardly to leave a smooth uninterrupted tread face. Inthis way it is conveniently carried on the wheel when it is not in useas already explained in connection with the tooth 33 for the wheel shownin Figures l and 2.

A description will now be given of that form of the invention shown inFigures ifi through iii wherein another single rim segmental wheel isshown although it may be adapted to double rim construction. The rim orthis wheel is fabricated from sections or segments of the shape shown inFigures le and i7 where two of the segments are connected together.'This segment includes a circular portion 3@ having outturned endsforming ground teeth @i the :faces of which lie in the saine radius asthat oi the wheel. The teeth Gi are bent outwardly from the bar 6E! inthe same direction as distinguished from oppositely directed groundteeth i3 and #it heretoiore described. Each segment dfi has a smooththin thread face {i2- 553 so the wheel will more readily sink into theground.

The outturned ground teeth @l are carried laterally of and project fromthe side of the segment Sid and hence the tread faces 63 of the groundteeth are also in the same plane or flush with the segment tread face52. In this way the combined rim tread faces of the wheel, including thefaces or edges of the segments (iQ-and the teeth 6i, are smooth and haveno projecting parts to dent, craclr or damage a hard road sur-- face' byjolting on it, hence the advantage of this construction. The twoadjacent teeth El form a double or multiple ply tooth.

A number, or two rows, of the segments Gil are joined together inmultiple ply form with the ground teeth Si pointed laterally outwardlythereby placing the smooth sides of the segments together in abuttingmanner as shown. Rivets S5 anchor the abutting segments together and theground teeth iii on the adjacent ends of the segment -fit closelytogether to reenforce each other. Rivets may also be passed through theabutting ground teeth to rigidly join them together if desired.

Spokes 66 radiate from a hub Sl and rivets 68 anchor the outer ends ofthe spokes to the segment rim E56. The spokes S8 may be staggered aroundand on opposite sides of the rim as shown or otherwise arranged. Anysuitable spoke and hub assembly may be used with these wheels.

For some classes of wheels, bar material having a bevelled edge 10, asshown in Figures 16 and 17, may be used if desired to reduce the widthof the tread face 62 and to produce a wheel which more readily sinksinto the earth and enables the ground teeth Si to secure a betterpurchase and hence afford great tractive effort.`

A fourth form of wheelis shown in Figures ,1 8 and 19 and issubstantially the same as shown in Figures 14 and l5 except that a solidring 11 is interposed between the two rows or lines of rim segments 6i),and thus formsanother multiple or triple ply construction. The solidring il aiTords a base on which to assemble the segments SB andoutwardly from which'projects the ground teeth Bl. Spokes 66 areanchored to the rim Sil-T. The tread face of the rim l? may as well beflush with the tread faces 62 of the segments Sii and hence is smoothand uninterrupted by anyparts such as projecting ground teeth or lugs ofprevalent use in tractor wheels. The free-end teeth have their flatfaces in or parallel to the wheel radius.

An outstanding feature of the wheels is that they are built so that theyrun free of clogging and balling up with dirt because of the free endflush type tread face ground teeth carried by and projecting from thewheels sides. Furthermore they may run on a road without damage theretobecause the tread face is ilush and smooth with the ground teeth. Alsothe segmentally built up rim may be easily repaired by removing brokenor bent rim segments.

Figure 2G shows another form of ground tooth of the projecting typewhich may be used with wheels shown in Figures 14, 18 and others. Thisground tooth is fashioned from a single bar and includes parallel sidesl2 and a point.'

T3. Bolt holes Vi4 are provided for bolts 15. It is an vadvantage topunch a number of holes lf3 in line so that the pair of bolts 'l5 may beplaced in any of the holes desired to adjust the distance of the point'F3 closer or further from the tread face of the rim. This tooth isshown -mounted in position in Figures i4 and l5 and it standing free-endteeth are formed of the same bar material. Although the teeth may beconstructed of cast iron and then bolted onto the iron rim means, it isusually preferred to make the teeth and rim integral and of bar stock,the

teeth having their working faces set radially or in the same directionas the wheel radius. The tread of the teeth and the tread of the rimmeans are also dened by the same radius.

What is claimed is:

l. A wheel including a rim fabricated from segments, the ends of eachsegment being bent outwardly in the same direction, the rim comprising amultiple ply construction made of abutting segments with their flatsides placed together and whose bent ends project outwardly frombothsides of the rim to form outstanding teeth, and anchorage means tosecure the segments together.

2. A wheel including a rim fabricated from segments, the ends of eachsegment being bent outwardly in the same direction, the rim consistingof a double row or two ply construction `made of abutting segments withtheir ilat sides placed together and whose bent ends projectr outwardlyfrom both sides of the double row or two ply rim to form outstandingteeth, and the teeth on each side of therim being placed together inabutting fashion' to form two ply teeth. f l

3. In a wheel, a continuous `ring forming a tread, segments fullyoverlapping and curved on the ring radius and attached to the ringthereby forming a multiple ply construction and ground teeth outturnedat the ends of each segment, and said teeth being disposed in abuttingrelation to form a multiple ply tooth construction.

4. In a Wheel, a continuous ring forming a tread face, rim segmentsattached to the ring and said segments having their tread facessubstantially ush with the continuous ring tread face, the ring andsegments forming the rim of the wheel, and each segment having each endbent outwardly therefrom to produce ground teeth having free endsoutstanding from the rim.

5. A tractor wheel comprising a row of circumferentially spaced groundteeth made of flat bar stock, a rim and tread means formed ofoverlapping fiat bar stock segments and having a flat side on which theinner ends of the teeth are carried, the outer ends of the teethstanding out freely from the rim and tread means; the radius of theouter tread edge of the rim, as well as the radius of the tread edge ofthe teeth, being the same so that the outer tread edges of both the rimand the teeth are iush and in the same circular line; said teeth beingset edgewise and in the planes of the wheel radii, and means to securethe segments together.

6. A unitary wheel construction comprising a rim lformed of overlappingsegments made of iron bar stock set edgewise, wheel spokes xed thereto,free-end teeth outturned on both ends of the segments and set flush withthe rim, and means to secure the segments together.

7. A wheel rim comprising closely related overlapping segments curved toconform to the circumference of the wheel, said segments being formed offlat iron Ibar stock set edgewise, the segments fully overlapping eachother whereby to bring together the ends of the successive segments toproduce a multiple ply rim construction, the ends of the segments beingoutturned from the rim to form free-end teeth having tread faces on thesame circumference as that of the rim, and the teeth of the segments ofeach ply abutting each other to form multiple ply teeth.

8. A wheel comprising a rim formed of flat overlapping bars set edgewiseto present the narrow edges thereof to the earth as a thin tread meansadapted to cut thru the ground surface, and traction teeth carried onthe sides of the bars at the ends thereof and also made of nat bar stockset edgewise to present the narrow edges thereof to the earth asadditional thin tread means also adapted to out thru the ground surface,the traction teeth aforesaid being formed of multi ply construction byabutting a number of the aforementioned bars to` gether to form saidteeth.

9. A wheel comprising a rim formed of flat overlapping bars set edgewiseto present the narrow edges thereof to the earth as a thin tread meansadapted to cut thru the gTOund surface, traction teeth carried on thesides of the bars at the ends thereof and also made of iiat bar stockedgewise to present the narrow edges thereof to the earth as additionalthin tread means also adapted to cut thru the ground surface, thetraction teeth aforesaid being formed of multi ply construction byabutting a number of the aforementioned bars together to form saidteeth, and one of the aforementioned bars being longer than the abuttingbar by which the teeth are of multi ply construction for a. part oftheir length and single ply construction throughout their remaininglength.

10. A wheel comprising a rim formed of flat bar stock set edgewise topresent a thin tread surface to the ground, said bar stock being swedgedto form offsets at intervals, said offsets being about equal to thethickness of the bar, yand teeth made of flat bar stock also setedgewise and carried on the rim at the swedged and offset portions andprojecting outwardly from the rim.

1l. A wheel comprising a rim formed of nat overlapping bars set edgewiseto present the narrow edges thereof to the earth as a thin tread meansadapted to cut thru the ground surface, traction teeth carried on thesides of the wheel rim at the ends of the bars and also made of fiat barstock set edgewise to present the narrow edges thereof to the earth asadditional thin tread means which is also adapted to cut thru the groundsurface, the traction teeth aforesaid being formed of multi-plyconstruction by abutting a number of bars tOsether to form said teeth,and one of the aforementioned teeth being longer than its abutting toothso that the teethlare of multi-ply construction for a part of theirlength and single-ply construction throughout their remaining length.

12. A tractor wheel comprising a relatively narrow rim formed of flatbar stock set edge` wise with its thin peripheral tread presented to theground, including spaced spokes forming an open wheel the tread of whichwill normally penetrate the ground a distance deeper than the radialwidth of the rim, traction teeth made of the same bar stock material asthe rim, said teeth carried on at least one side of the wheel rim andprojecting sidewardly therefrom, both the teeth and rim having ushtreads formed on the same peripheral line; and auxiliary teeth carriedon the traction teeth and adjustable in position thereupon, saidauxiliary teeth projecting beyond the periphery of the rim and itstraction teeth for use in deep loose soil, and said auxiliary teethbeing movable in relation to the rim and sidewardly projecting tractionteeth to adapt the wheel to roll thereon when used for road travel.

WILLIAM H. LEDBETTER.

